I have added 6 more outline numbered styles to a template which is attached
to all our documents.

Whilst the new styles are visible when creating new docs based using this
template, they are not available when editing previous docs created using the
older version of the same template. I thought that when you open an existing
doc, the new styles would automatically be available once the template was
updated.

The only way I can get them attached is by going into the organiser and
copying over the styles from the template in the template directory to the
actual doc.

Is there an alternative way to handle this as there are thousands to
precedents we need to have these new styles available in?

Thanks in advance.